Head for a surface-treating machine



FIG. 1 is a perspective view of a head for a surface-treating machine showing my new design;

FIG. 2 is a front elevational view, the opposite side being the same in appearance as the side shown;

FIG. 3 is a top plan view shown on a slightly smaller scale;

FIG. 4 is a side elevational view shown on a slightly smaller scale, the opposite side being the same in appearance as the side shown; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a head for a surface-treating machine, substantially as shown and described. 